Elevator attachment



(No Model.) 2 Sheets-Sheet l. W. E. NIOKERSON.

- ELEVATOR ATTACHMENT.

No. 397,746. Patented Feb. 12 1889.

N PETERS, Pnolo-Lmw n m Wanmngmn, 01c.

( 1 2 SheetsSheet 2. W. E. NIGKERSON.

ELEVATOR ATTACHMENT. No. 397,746. Patented Feb. 12, 1889.

Fi 5C2- Nirnn STATES PATENT Crricn.

*ILLIAM E. NICKERSON, OF CAMBRIDGE, MASSACHUSETTS.

ELEVATOR ATTACH ENT.

SPECIFICATION forming part of Letters Patent No. 397,746, dated February 12, 1889.

Application filed October 17, 1883. Serial No. 288,318. (No model.)

T 0 all 207mm [15 may concern:

Be it known that I, WILLIAM E. NIOKER- SON, of Cambridge, in the county of Middlesex and State of Massachusetts, have invented certainnew and useful Improvements in Elevator Attachments, of which the following, taken in connection with the accompanying drawings, is a specification.

The object of my invention is to stop the direct-operating machinery of the elevator from continued action when from any cause the elevator-carriage is checked in its downward motion sufficiently to cause the rope to become slack and liable to be caught in the machinery and be injured or to cause further accident and injury. This object I attain by the mechanism shown in the accompanying drawings, in which- Figure 1 is a perspective view showing my attachment applied to an ordinary elevatorhoisting apparatus. Fig. 2 shows details in section, and Fig. 3 is an illustrative diagram.

It is well known to manufacturers and users of elevators that, under all circumstances, when an elevator-rope breaks or becomes slack it is better to have the actuating mechanism stop, as a continued motion is almost always accompanied with injury to the machinery and oftento the person.

My invention is particularly adapted to the case in which a rope becomes slack from the stopping of the elevator-carriage during its descent and while the rope is still being uncoiled, as in such a case the rope thus freed is almost sure to become entangled in the machinery, and either become broken itself or break other parts of the machine.

111 the drawings, \V V represent the part of the frame-work which holds the hoisting-gear of an elevator.

T is the main shaft running in housings. Upon one end of the shaft T the hoisting pulley or drum T is attached, and upon the other end a worm-gear, T the whole being driven by a worm, H, 011 the shaft H, the shaft H being driven by reversing-belts, (not shown,) that operate on the pulleys L, L, and L the pulley L being rigidly attached to the shaft H, the others being loose. The belts referred to are moved from one pulley to another, in the usual manner, by the belt-shifter M, said shifter M being provided with a rack, M, with which a pinion, M on the shaft M engages.

P is a wheel, about which the hand or re versing rope P P passes for the purpose of enabling the user of the elevator to control the motion of the carriage through the beltshifting apparatus already described.

The parts referred to above are not new, and with slight modifications are in common use. 6o

My safety attachment, which I will now pro c-eed to describe, is controlled in its action by a latch, which is held in place and out of action by the inside pressure of the hoistingrope, (when on the drum,) and is released and thrown into action whenever the rope on the drum becomes slack.

My device, as represented, acts through the rope R directly on the belt-shiftingrope P, to which the rope R is attached by a clasp, R", although the rope R might operate the belt-shifter by means of a pulley on that shaft.

The latch B is connected to the interior of the hoisting-drum T, as shown in Fig. 2, and is adapted to slide in and out, its tendency to outward motion being given it by the spring B said spring being adjusted as to tension by the screw-follower B B is a screw or pin, the point of which rests in a slot made in the latch B,as shown in Fig. 2, and serves to limit the motion of the latch.

13 is a holding-jack, one end of which rests on the latch B, and the other end is pressed upon by the rope T on the hoisting-drum. In the drawings, Fig. 2, the holding-jack B is represented as being held against the latch B by'the last coil of the rope T, although any of the coils would work as well while on the drum, the last coil being selected for the reason that it is always on the drum, even when the elevator-carriage is at its lowest point.

It is obvious from the construction of the latch B and the holding-jack B that so long as the jack B is held firmly (by the pressure of the rope T against the latch B it (the latch) cannot slide out, and also that in case the rope T is slack, then the jack will no longer hold the latch B, and its spring B will throw it out so that its end will project beyond the face of the drum and come in contact with the lever R, the function of which is explained below. The jaek 15', Fig. i, has made in it a slot, Z), which receives the end of the holdingserew I).

allow it to fall out; of its plaee. The lever R is pivoted at R and has at its lower end R, a

rope or chain, R", whieh passes over a rollm',

lllilClllllOTy working to lower the elevator-eari riage, the belt being set For that purpose:) If the rope T slacks on the drum T from the fact that the elevator-earriage has been aeei' dental I stopped, or for an y other reason, then,

there being no pressure on the jack 13', it will cease to hold the latch B, will iinnledi- 7 scribing witnesses, on this '1 tith d ay of October,

ately be thrown out hy the spring- B and, its end coming in Contact with the lever R R as the drum T revolves, will throw the lever over and eause its lower end, R to draw on the rope R", and through it the rope I and thus act on the belt-shitting device and eause This device allows the jack to inove a limited distanee loi'igitudinally, but will not rope, with the lever it R and the belt-shlt'ting' devices, all. substantially as described.

2. The combination of the drum T, jaek ll, and latt-hll with the lever R R, rope It, roller R and Slllftllld'OPt}I all operatingtogether si'ihstantially as deserihed, and for the purt pose set forth.

In testiinon y whereo't' I have si g'n ed my name to this speeilieation, in the presence of two sub- A. fl). 1988.

\YI'L'LIAIAI E. NH h I ltsUN. Witnesses:

FRANK (l. lluuucn, Mlvwrimw M. BLUN'I. 

